A Semiempirical Quantum Approach to the Formation of Carbon Dioxide Adsorbates on Pt(100) and Pt(111) Cluster Surfaces

The geometries and binding energies of CO2 adsorbates on Pt(100) and Pt(111) cluster surfaces were calculated by means of an improved version of the extended Hückel molecular orbital method. The polarization of the surface by an applied electric potential and coadsorption of H atoms were included in...

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Bibliographic Details
Published in:Langmuir 1998-07, Vol.14 (14), p.3901-3908
Main Authors: Zinola, C. F, Gomis-Bas, C, Estiú, G. L, Castro, E. A, Arvia, A. J
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Solid-gas interface
Surface physical chemistry
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Summary:The geometries and binding energies of CO2 adsorbates on Pt(100) and Pt(111) cluster surfaces were calculated by means of an improved version of the extended Hückel molecular orbital method. The polarization of the surface by an applied electric potential and coadsorption of H atoms were included in the model. For simulated applied potentials in the range −1.0 to 1.0 V, CO2 coordination geometries (side-on, formate) involving two adsorbate atoms bonded to the surface are favored, regardless the surface topology and the presence of coadsorbed H atoms. In agreement with experiment, larger binding energies are always calculated for the Pt(100) cluster surface.
ISSN:0743-7463
1520-5827
DOI:10.1021/la980447+